Maintenance & Fuel · Free tool
Free Oil Change Interval Calculator
Choose your oil type, enter the mileage at your last change and how far you drive. The calculator shows the mileage your next oil change is due at, and how long that will take you.
- Free to use
- No signup
- Runs in your browser
Your oil
Optional. If you enter it, it replaces the typical figure above.
Your car
How you drive
Next oil change due at
52,000 mi
3,500 miles from now.
Or 12 months after the last change, whichever comes first.
- Interval used
- 10,000 miles
- Time between changes at your mileage
- 10.0 months
- Oil changes a year
- 1.2
- What limits you
- Mileage
If your car has an oil-life monitor, follow it. It measures how the engine has actually been used.
An estimate from the figures you enter, not a quote. Read the disclaimer. Updated .
02Your result
What your oil change interval means
An oil change is due by distance or by time, whichever arrives first.
- 01
Next change due at
The odometer reading at which the oil should be changed: the mileage at your last change plus the interval for your oil.
- 02
Time between changes
How long the interval lasts at your yearly mileage. If that is more than 12 months, the calendar decides instead.
- 03
Severe service
If any of the four driving conditions apply to you, the typical interval is too long. Your owner’s manual gives a shorter one.
What to do next
See everything else that is due
Oil is one service. The schedule lists the rest for your mileage.
Maintenance scheduleChoose the right oil
Viscosity, synthetic against conventional and what the change should cost.
Oil and fluids guideBudget the upkeep
Put oil changes together with the car’s other running costs.
Ownership cost calculator
03How it works
The oil change interval formula
The sum is simple. The interval itself comes from your oil type, or better, from your owner’s manual.
Next change due at = mileage at last change + interval
Months between changes = interval ÷ (miles per year ÷ 12), limited to 12 months
Change the oil once a year even if you have not covered the miles.
What each term means
- last change
- The odometer reading when the oil was last changed.
- interval
- Miles between oil changes: the figure in your owner’s manual, or the typical figure for your oil type.
- miles per year
- How far you drive in a year.
- 12 months
- The longest any car should go between oil changes, whatever the mileage.
What the tool assumes
- Typical intervals for gasoline engines, from AAA’s guidance.
- Full synthetic uses the low end of AAA’s 10,000 to 15,000 mile range.
- Normal driving. Severe service needs the shorter interval in your manual.
- An interval you enter from your owner’s manual replaces the typical figure.
04Worked example
Oil change interval example on full synthetic
A car on full synthetic oil, last changed at 42,000 miles, now showing 48,500 and driven 12,000 miles a year.
- 01
Pick the interval
Full synthetic, low end of AAA’s range
10,000 miles
- 02
Add it to the last change
42,000 + 10,000
52,000 miles
- 03
Find the miles left
52,000 − 48,500
3,500 miles
- 04
Find miles driven a month
12,000 ÷ 12
1,000 miles
- 05
Turn the interval into time
10,000 ÷ 1,000
10 months
Next oil change due at
52,000 mi
That is 3,500 miles away. The interval lasts 10 months at this mileage, inside the 12-month limit, so mileage decides.
Try your own numbers05Background
How often to change your oil
The 3,000-mile oil change belongs to older engines and older oils. AAA’s guidance is that manufacturers now recommend changes every 5,000 to 7,500 miles for most engines, with the oil type setting where in the range you fall.
| Oil type | Typical interval | Used by the calculator |
|---|---|---|
| Conventional | Every 5,000 miles | 5,000 miles |
| Synthetic blend | Every 6,000 miles | 6,000 miles |
| Full synthetic | Every 10,000 to 15,000 miles | 10,000 miles |
Time matters as well as distance. Oil ages in the engine whether or not the car moves, so the oil should always be changed once a year even when the mileage has not been reached.
Some driving is harder on oil. AAA lists four conditions that count as severe service:
- Mostly short trips of 5 miles or less
- Extremely hot, cold or dusty climates
- Sustained stop-and-go driving
- Carrying heavy loads or towing a trailer
If any of them describes your driving, use the severe-service interval in your owner’s manual. For oil grades and what a change should cost, see the oil and fluids section.
06When to use it
When to use an oil change interval calculator
Use it when the sticker on the windshield has gone, or when you suspect it was written for a different oil.
After buying a used car
Set a due mileage from the last change in the service history.
To check a shop’s sticker
Compare the mileage they wrote with the interval for the oil they used.
If you drive very little
Find out whether the 12-month limit reaches you before the mileage does.
If you tow or make short trips
See whether your driving counts as severe service.
Mistakes to avoid.
- Changing synthetic oil every 3,000 miles out of habit, which costs money for no benefit.
- Stretching the interval because the car is hardly driven. Time still counts.
- Using the typical interval when your driving matches a severe-service condition.
- Ignoring the oil level between changes. Check the dipstick, especially on an older engine.
07Related guides and tools
Keep going from here.
Guides that go with this tool
Related tools
- Maintenance Schedule GeneratorList the services due now and next for your mileage, with typical intervals.
- Car Ownership Cost CalculatorAdd up fuel, insurance, maintenance and depreciation over five years.
- Repair Cost EstimatorBuild a repair estimate from parts, labor hours and shop rate, and compare it with national averages.
08Questions
Oil Change Interval Calculator: your questions.
How often should I change my oil?
Most engines need an oil change every 5,000 to 7,500 miles, according to AAA. Conventional oil is generally changed every 5,000 miles and full synthetic every 10,000 to 15,000 miles. Your owner's manual gives the figure for your engine.
How many months can I go between oil changes?
No more than 12. AAA’s guidance is to always change the oil once a year, even if you have not reached the mileage.
Does synthetic oil last longer?
Yes. AAA gives 10,000 to 15,000 miles between changes for full synthetic, against about 5,000 miles for conventional oil and 6,000 for a synthetic blend.
What counts as severe driving?
AAA lists four conditions: mostly short trips of 5 miles or less, extremely hot, cold or dusty climates, sustained stop-and-go driving, and carrying heavy loads or towing a trailer.
Is the 3,000-mile oil change still necessary?
Not for most modern cars. Current guidance is 5,000 to 7,500 miles for most engines, and longer on full synthetic oil. Follow your owner’s manual.
09Estimates and sources
Read this before you rely on it.
Built and checked by CarTipsMentor Team. Last updated . How we check our work.
Sources
- [1]AAA Automotive, How Often Should You Change Your Oil?
- [2]AAA Automotive, Time-Stamped Car Maintenance Checklist
- [3]AAA Automotive, Auto Parts Prices Explained